Self feeding tube cutter



p 19 4- J. E. KENERSON 1,977,441

SELF FEEDING TUBE CUTTER Filed July 24, 1933 INVENTOR. Jasep/z if/fewexzra/z ATTORNEY.

fiatented Get. 16, 1934 PA TENT OFFICE tree STATES- 1 2 Claims.

The invention relates to a self-feeding tube cutting devise of the type that automatically sets the feeding mechanism when the pipe is clamped in position. 53 The invention consists of a U-shaped spring frame having on its open end a pipe holder and cutter respectively, which are brought into working relation to each other by a bolt extending through the frame and having a butter-fly nut IO'ithreaded on one end for operating the legs to determine the relation of the cutting and the pipe support for supporting the pipe in relation to cutter and setting the devise for automatically feeding the cutter.

The invention further consists of a novel bearing for the cutter consisting of a depression in the leg of the frame, over which a re-enforcing plate is superimposed forming a bearing for the cutter shaft and also serves as a reamer by providing ZQ-Jcutting edge of V-shapcd formation to finish the product.

The object of the invention is to provide a tube cutter with an automatic feed which is durable and efficient and cheap to manufacture.

Referring to the figures:

Figure 1 is a side elevation of the improved self feeding tube cutter.

Figure 1A is a detail view of support for the cutter.

Figure 2 is a plan view of the improved selffeeding tube cutter.

Figure 3 is a front elevation.

Figure 4 is an enlarged cross-section taken through the cutter, tube and tube support.

Figure 5 is a modified view showing a roll instead of a depression for supporting the tube.

Figure 6 is a modified view of the same devise changed in form and position but having the same elements and function.

Referring to the drawing illustrating the improved self-feeding pipe cutter A for cutting the pipe B. The cutting devise consists of a spring frame 10 of a U-shape, one leg of which supports the pipe B and the opposite end supports the g5; cutter 11.

The leg supporting the pipe B is provided with a supporting depression 12 to allow the pipe to automatically centre itself in relation to the said outter. The edges of the pipe supports are turned over as indicated by the numerals 13 and 14 to increase the strength and rigidity of the member to compensate for the clamping and holding strains during the cutting operation. Formed in both legs are holes adapted to receive a bolt 15. -The head of the bolt 15 rests against the outside surface of the frame and takes the pull against the tension of the spring frame when the butterfly nut 16 is turned on the threaded portion of the bolt 15.

The legs of the frame will open and close in accordance with the direction of rotation of the butter-fly nut 16 which operates with and against the tension of the spring member for clamping or releasing the pipe.

The bolt in its operation also serves to automatically increase the tension of the spring frame so the cutter 11 will be self-feeding when the frame is rotated during the cutting operation. Secured to one of the legs of the frame is a strengthening plate 17 held in position by the rivets 18. The outer end of the plate 17 is approximately V-shaped across the flat having reaming cutting edges which can be inserted in the pipe after it is cut to ream the burr or rough edges to make a finished job. The plate 1'7 with the leg of the frame to which it is fastened serves as a bearing for the cutter shaft 19 having a screw head 20 at one end and a nut 21 threaded on the opposite end for holding the shaft in position. The leg is rounded out at 22 to form the bearing 19 and is held in position by the plate 17.

Formed in the leg and plate 1'7 are slots 23 and 24 respectively to allow the cutter to be placed in position on the frame in the working relation to other members.

Figure 5 is a modified view of the pipe support having rolls 25 and 26 for supporting the pipe instead of the depression 12 as illustrated in Figure 1.

Figure 6 is another modified view showing the cutter in relation to the pipe with the same elements of construction but changed in shape and location. Figure 6 shows a coil spring 27 anchored at one end on the operating rod 28 which is threaded into the frame member 29 and. operates the cutter. The cutter is mounted on a swinging lever so having its lower extension of sufficient dimension to allow a hole to be drilled therein adapted to receive the coil spring 17 to give direction of movement in one direction while a coiled axial spring returns it in the opposite direction. When the pipe is clamped into position by the rod 28 the tension and compression on the spring serves to automatically feed the 105 cutter through the tube during the cutting operation as the frame revolves around the pipe.

In operation the tube B is placed in position between the cutter 11 and depression support 12. The butter-fly nut is turned which draws the 110 U-shaped spring frame, a pipe holder on one leg of the frame, a cutter on the opposite leg, a curved bearing portion in the latter leg of the frame, a re-enforcing flat plate superimposed on the leg and held in position by rivets, slots in both members, and a shaft located in the curved portion between the plate members for supporting the shaft on which the cutter revolves.

2. In a self-feeding cutting devise comprising a U-shaped spring frame, a pipe holder on one leg of the frame, a cutter on the opposite leg, a curved bearing portion in the latter leg of the frame, a re-enforcing fiat plate superimposed on the latter leg and held in position by rivets, slots in both members, and a shaft located in the curved portion between the plate members for supporting the shaft on which the cutter revolves, and means in relation to the spring frame for flexing adjusting and clamping the said frame to automatically feed the cutter into the tube during the cutting operation.

JOSEPH EDWARD KENERSON. 

